Locomotive-arch construction.



- E. P. STEVENS. Locomotive ARCH cowsmucnow.

APPLICATION FILED FEB. l0, l9l6,

Pm, M11012, 1917.

' which I employ a single pattern long enough to co-act with IEBIOGH 1?. STEVENS, 01F CHIGAGQ,

03! NEW YORK. It.

ILLINOIS, Assrenon T0 r, a eoarona'rron or noeonorrvaancn consrnuerron.

To all whom it may concern:

Be it known that I, ENOCH P. S'rnvnns, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Locomotive-Arch Constructions, of which the following is a specification.

y invention relates to arch constructions 'or locomotive fire-boxes and has special reference to improvements in the construction and arrangement of the marginal bricks of such arches.

A marginal brick occupies the space between the outermost water circulating arch tube and the adjacent side sheet of the firebox. Even in a single firebox the distance between the arch tube and the side sheet varies from end to end of the box. It has been the practice to install marginal bricks upon the tube and against the side sheet and to compensate for the varying distance between the side sheet and arch tube by the use of bricks of diflerent lengths at the diiferent points. And likewise, it has been necessary to employ marginal bricks of different lengths in difl'erent fireboxes.

It is desirableto limit the number of sizes or patterns of marginal bricks which are required to construct arches in the differing fireboxes of locomotives. With this end in View I have devised, and my invention consists in, an arch construction in main marginal bricks of a side sheet when the same is at the normal or most usual distance from the support of the inner end of the brick, in combination with a compensatinw 0r spacing key which enables the marginal brick to be used when: its support and the the spacing between side sheet is greater than said normal dison reference tothe Fig. 4

tance.

My invention will be readily-understood drawings that form part of this specification, and in which Figure 1 is a vertical transverse section of a locomotive firebox containing my invention; Fig. 2 is an enlarged View depicting a side sheet, an arch tube and my novel marginal bricks; Fig. 3 is a plan view thereof; and illustrates a simplified form of the Invention.

Further referring to the drawings, 2 and Epeciflcation of Letters Patent. Application filed February 10, 1916. Serial No. 77,517.

widths.

Patented June 1%, lml 't.

2 represent one of the side sheets locomotive firebox ;3, 3 are the outermost arch tubes ;and 4, 4 the intermediate arch tubes. It will be understood that these arch tubes are in substantial parallelism with the sidesheet, longitudinally of the will also be understood that the arch tubes are lnclined forwardly and downwardly in the firebox. i

In Fig. l I have shown a condition,

which, though not usual, is nevertheless frequently encountered in locomotive fireboxes. One arch tube (3 is near enough to its side sheet (2 to allow the use of, a

marginal brick, b, of standard or most common length; while the other tube (3) is so far from the side sheet (2) that a marginal brick, b, of standard length can find no direct support upon the adjacent side sheet.

This condition calls forth and is typical of my invention. Rather than substitute a longer marginal brick, I use a standard brick, b, and a smaller, supplementary key brick, c, which latter rests against the side sheet of the firebox and provides a support or abutment by which the brick, b, is held in its proper inclined position.

The key brick, c, is wedge shaped; to the end that the same and a brick, b, may be adjusted to All of the key bricks so used in an arch may be of one pattern or size. Each has a straight edged back, 0, which bears against the side sheet of the firebox. The inner edge of the key brick which abutment for the outer end on brick, b, may be either plainly inclined, as shown at c in Fig. 4,0r may be stepped, as shown at c in Fig. 2. I prefer the steps, 0 as they provide a surer support and engagement for 105 the outer end be two or more the number of of a 55 firebox. It. so

that each marginal brick 70 marginal spaces of diiferent forms the to the more or less pointed end,

I supporting b and 0,

dated. The back of the brick, c, is-prefera'blychanneled (see c) to reduce the extent of its bearing on the side sheet and to avoid contact with the ends of the side sheet stay,- bolts (not shown). The inner surface of the key (0 or 0?) contains a vertical groove or grooves, c, which substantially conforms 12 of the main brick, By this engagement, the bricks b and c are interlocked and the dislodgment or disarrangement ofthe key brick is prevented.

By the use of bricks of the two patterns, the margins of a refractory arch may be easily and quickly constructed in practically any firebox which contains arch tubes. thus described my invention, I

Having to secure by Letters claim as new and desire Patent I 1. The improvement herein described comprising the side sheet and an arch tube of a locomotive firebox, in combination with a main marginal brick extending from said tube toward said side sheet, and a substantially wedge shaped key brick interposed between theen'd of said main brick and said side sheet and forming the abutment for the outer end of said main brick.

2. The improvement ,herein described comprising the sidesheet and an arch tube of a locomotive firebox, in combination with a marginal brick extending from said tube toward said side sheet and a substantially wedge shaped key bric interposed between the end of said main 'brick and said side sheet and forming the abutment for the outer end'of said main brick andthe abutting portions of sald bricks being interlocked, substantially as described.

3. The improvement herein described comprising the side sheet and arch tube of a locomotive firebox, in combination with a main marginal brick extending from said tube toward said side sheet and a substantially wedge brick interposed the end of said main brick and said side sheet and forming the abutment for the outer end of said main brick.

4:. The comprising the side locomotive firebox, main marginal brick tube toward said side sheet, and a substanally wedge shaped,.stepped, adjustable key brick interposed between the end of said main brick and said sidesheet and forming the abutment for the outer end of said main brick and the abutting portions of sai bricks being interlocked, substantially as described.

5. A marginal arch brick supplement, comprising a substantially wedge shaped, stepped keybrick, having an interloclnng groove in its brick abutment face, substantially as described.

6. A marginal arch brick supplement, comprising a substantially wedge shaped, stepped key. brick, having an interlocking groove in its brick abutment face, and having a channeled back, substantially as described.

In testimony whereof, I have hereunto set my hand this 8th day of January, 1916.

' ENOCH P. STEVENS.

improvement herein described sheet and arch tube of a in combination with a extending from said shaped, stepped, adjustable key 

